Abstract：According to the deficiency that the parameters cant be singly controlled in the traditional experiment, a 3D rotating model of 1000MPa simple piston gauge has been established to probe the effects of fluid viscosity, piston rod modulus and piston-cylinder gap on the pressure reproduction of piston gauge based on two-way fluid-structure interaction technique. The results show that the pressure distribution along the piston-cylinder gap from the inlet to the outlet generally experiences first approximate-linear decrease of pressure with the quick decline down to 30% of the balance pressure, then through a small pressure fluctuation, and finally approximate-linear slow decrease of pressure till to zero. The piston rod shrinkage decreases due to the increase of the elastic modulus of piston rod, the decrease of the fluid viscosity and piston-cylinder gap, while the effective area of the piston gauge increases due to the increase of the elastic modulus, the fluid viscosity, and the decrease of the piston-cylinder gap. Moreover, the effective area increases approximately 1.3% in maximum when the fluid viscosity doubles, which affects on the effective area of piston gauge most, while the effective area increases less than 0.04% in maximum when the elastic modulus of piston rod increases 10 times, which affects on the effective area least.
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2021, Vol. 42 
